This black t-shirt features a humorous "Knock Knock Who's There? Doctor" joke printed in bold white lettering. The shirt is made from a soft, comfortable fabric, likely cotton or a cotton blend, and has a classic crew neck and short sleeves. Its casual style makes it ideal for everyday wear. This tee is perfect for those with a playful sense of humor or anyone in the medical field. Wear it to social gatherings, casual outings, or even as a conversation starter. A fun and lighthearted addition to any wardrobe!